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java.lang.Objectjavolution.io.Struct
javolution.io.Union
public abstract class Union
This class represents a C/C++ union
; it works in the same
way as Struct
(sub-class) except that all members are mapped
to the same location in memory.
Here is an example of C union:
And its Java equivalent:
union Number {
int asInt;
float asFloat;
char asString[12];
};
As for any
public class Number extends Union {
Signed32 asInt = new Signed32();
Float32 asFloat = new Float32();
Utf8String asString = new Utf8String(12);
}
Struct
, fields are directly accessible:
Number num = new Number();
num.asInt.set(23);
num.asString.set("23"); // Null terminated (C compatible)
float f = num.asFloat.get();
Nested Class Summary |
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Nested classes/interfaces inherited from class javolution.io.Struct |
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Struct.Bool, Struct.Enum16, Struct.Enum32, Struct.Enum64, Struct.Enum8, Struct.Float32, Struct.Float64, Struct.Member, Struct.Reference32<S extends Struct>, Struct.Reference64<S extends Struct>, Struct.Signed16, Struct.Signed32, Struct.Signed64, Struct.Signed8, Struct.Unsigned16, Struct.Unsigned32, Struct.Unsigned8, Struct.UTF8String |
Field Summary |
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Fields inherited from class javolution.io.Struct |
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MAXIMUM_ALIGNMENT |
Constructor Summary | |
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Union()
Default constructor. |
Method Summary | |
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boolean |
isUnion()
Returns true . |
Methods inherited from class javolution.io.Struct |
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address, array, array, array, array, array, array, array, byteOrder, getByteBuffer, getByteBufferPosition, inner, isPacked, read, setByteBuffer, setByteBufferPosition, size, toString, write |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public Union()
Method Detail |
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public final boolean isUnion()
true
.
isUnion
in class Struct
true
Union
|
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